Word on corners of the interwebz has it that this is gonna prove the existence of aliens (or at least gov. are gonna frame JW as the indicator of alien life)
It could find a candidate biosphere. If we see a lot of free oxygen or other super reactive things like fluorine that would be very suggestive. It’s not proof but we don’t know many other processes that can maintain a high percentage of oxidizers in an atmosphere.
If we saw that the next step would probably be a telescope designed specifically to observe that target. There are some thoughts about using a telescope out near Pluto that could use the sun as a gigantic gravitational lens to photograph an exoplanet and get very detailed spectroscopic information.
If we have a planet nine that is a primordial black hole that would be an absolute killer gravitational lens.
